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Spatial Separation of Molecular Conformers and Clusters
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Molecular electrostatics for probing lone pair-π interactions.

Neetha Mohan1, Cherumuttathu H Suresh, Anmol Kumar

  • 1Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, 695019, India. sureshch@gmail.com.

Physical Chemistry Chemical Physics : PCCP
|October 3, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces an electrostatics method to analyze weak interactions between lone pair molecules and electron-deficient π-systems. The molecular electrostatic potential (MESP) value at negative minima (Vmin) accurately predicts interaction energy and orientation.

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Area of Science:

  • * Computational Chemistry
  • * Molecular Interactions
  • * Quantum Chemistry

Background:

  • * Understanding weak interactions is crucial in chemistry and molecular recognition.
  • * Molecular electrostatic potential (MESP) provides insights into electron distribution and reactivity.
  • * Electron-rich lone pairs and electron-deficient π-systems are key interacting partners.

Purpose of the Study:

  • * To develop and validate an electrostatics-based approach for quantifying lone pair-π interactions.
  • * To correlate molecular electrostatic potential (MESP) values with interaction energies.
  • * To predict the orientation of interacting molecules using electrostatic properties.

Main Methods:

  • * Density Functional Theory (DFT) calculations were employed to model molecular interactions.
  • * Molecular electrostatic potential (MESP) topography and minimum values (Vmin) were analyzed.
  • * The Electrostatic Potential for Intermolecular Complexation (EPIC) model was utilized.

Main Results:

  • * A strong correlation was found between the Vmin of electron-rich systems and lone pair-π interaction energy (E(int)).
  • * The electrostatic approach effectively characterizes the interaction between lone pairs and π-deficient systems.
  • * The precise location of MESP minima aids in predicting molecular orientation during complex formation.

Conclusions:

  • * The proposed electrostatics-based method accurately probes weak interactions between lone pair and π-deficient systems.
  • * MESP (Vmin) serves as a reliable descriptor for quantifying electron-rich character and interaction strength.
  • * This approach facilitates the prediction of intermolecular complexation orientation.